Thank you for your query.
If your child is active,feeding well and pooing without any difficulty then most probably your child is healthy and well.
However the fail proof method would be to go for a stool test
to detect blood in stool
.If it reveals blood then you might have to consult a doctor. You haven't mentioned the age and the diet of the child .Some food particles can mimic blood clots
I hope your child will stop passing these things soon.
Hope this answers your query.have a nice day.